VMAXTANKS LFP27-12100 Lithium Iron Phosphate (LiFePO4) Battery – 12 Volt (12.8 Nominal Voltage). 100Ah, 1280Wh, Group 27. BATTERY MANAGEMENT SYSTEM (BMS): The built in BMS system provides safe and reliable operation of your Lithium Iron battery. The advanced BMS in Vmaxtanks Lithium Iron batteries provides high voltage / low voltage protection. Great for Trolling motors and boats. Over discharge protection and over charge protection. High/low temperature charge and discharge protection. Short circuit protection and automatic cell balancing.